Three secondary charge 12 hours.

This question is closely above the battery activation problem, let's set up the factory battery electrode passivation phenomenon to the user's hands, deep charge deep discharge cycle three times to activate the battery. Fact, this problem into deep charge is not to charge 12 hours

Problems. Then another piece of article "On the phone battery charging time already answered this question.

The answer is no need to charge 12 hours.

Early phone nickel-metal hydride batteries because of the need to complement and trickle charge process, to achieve the most the perfect fully charged state, may take about five hours, but also do not need 12 hours of constant current and constant voltage charging lithium-ion battery characteristics decided

Its deep-charging time without 12 hours.

Someone will ask for the lithium-ion battery, since the constant voltage phase lithium ion battery current is gradually reduced, is not when the current to the infinitesimal real deep charge I have to draw the constant voltage phase current decreases on time curve, it carried more

Ci curve fitting, and found that this curve can be a function of 1 / x close to zero current, actual test because of the phenomenon of self-discharge lithium-ion battery, the zero current never reach.

600mAh battery, for example, setting up current 0.01C (i.e. 6mA), the 1C charging time does not exceed 150 minutes, then set up to the current of 0.001C (0.6mA), the charging time may be 10 hours - - This is because the accuracy of the instrument

Has not accurately obtained from 0.01C to 0.001C was capacity by only 1.7mAh multi over seven hours in exchange for mere thousandths less than the capacity of any practical significance . Moreover, there are other charging

Way, such as pulse charging the lithium-ion battery to limit voltage of 4.2V, it is no cut-off minimum current judgment stage, generally after 150 minutes, it is 100% fully charged up. Many mobile phones are with pulse charging.

Someone once fully charged, the cradle and then be charged to confirm the degree of the phone's fully charged, this test method is less stringent.
Mobile power pack, iphone backup battery case, iPad backup battery

First cradle green light not detected truly fully charged or not a basis.
Only the final method of detection of the lithium-ion battery is fully charged or not is to test without charge (or discharge) state lithium-ion battery voltage.
The so-called constant voltage phase current is reduced to its true purpose is to gradually reduce the additional voltage on the internal resistance of the battery charging current, current 0.01C, 6mA, current multiplication and the internal resistance of the battery (usually at 200 cents Europe within) only 1mV,

To believe that when the voltage is not the current state of the battery voltage.

Second, the reference voltage of the cell phone is not necessarily equal to the cradle of the reference voltage, cell phone fully charged battery into the cradle, cradle do not think has been fully charged, but continue to be charged on.